Damn, I knew I forgot something. Ok, Genesis works with the wiki settings. It is really heavy flickering, it looks like it is moving one pixel up and down all the time. I always heard that the 480i handling of the OSSC is bad, but that bad?
You posted that you have a tube TV but yet you post that the 480i on the OSSC is that bad? It should look very similar to your tube TV. In fact the tube should give you more headaches than an LCD. Are you sure its not flickering more than 1 pixel up and down?